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What is the hardest material on earth?

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Diamond is the hardest naturally occurring substance found on Earth. But it is not the hardest substance. Wurtzite boron nitride (synthetic) and lonsdaleite (which comes from meteorites) are both harder. 

But, This is little bit controversial as scientists are working on this and found out that there are so many materials which are stronger than Diamond.

Currently, diamond is regarded to be the hardest known material in the world. But by considering large compressive pressures under indenters, scientists have calculated that a material called Wurtzite Boron Nitride (w-BN) has a greater indentation strength than diamond.

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If you are given to choose between diamond and wurzite Baron nitride, which will you choose? I will go for diamond. If you were to opt between diamond and Ionsdaleite, I will ought for diamond. Why? Because we have seen and used diamond and found out it was the hardest material on Earth.
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Diamond is regarded to be the hardest known material in the world. By considering large compressive pressures under indenters, Wurtzite boron nitride has a greater indentation strength than Diamond. 
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A shiny DIAMOND is the hardest material on the earth, it is very expensive. And also rare in the earth. The largest  diamond producing country is RUSSIA .
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Diamond is the hardest thing here on Earth. That makes most women love to have a diamond ring before getting married. Can you blame them?
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No. Qcarbon and graphene are both stronger than diamond and from carbon. It is possible to even manufacture your own graphene by using youtube videos as a guide. Graphene is made from graphite.
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Diamond is the hardest material known. 70 to 150 SPa is the thickness. Q carbon is 60 percentage harder than diamond. But it is to be proved.
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The hardest material on earth is currently believed to be diamond, which has a score of 10 on the Mohs hardness scale. Other materials that are extremely hard include boron nitride, which is often used as a diamond substitute in high-pressure experiments, and silicon carbide, which is used in abrasives and cutting tools. However, there may be other materials that are even harder that have not yet been discovered.
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The hardest material on earth is metal.

Metals are the most common material on earth because they are difficult to produce and process. The process of production of metals is the process that creates new metal materials.
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Diamond is the hardest known material to date, with a Vickers hardness in the range of 70–150 GPa. Diamond demonstrates both high thermal conductivity and electrically insulating properties, and much attention has been put into finding practical applications of this material.
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 Some people may find metal content in the earth difficult to process and produce goods with, while others may find some types of rocks difficult to walk on and process.
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The hardest material on earth is DIAMOND

 

Diamond and graphite are allotropes of carbon, but diamond is hard wheras graphite is not that hard with some pressure graphite can be broken but not diamond 

Though they are the pure forms of the same element that differ in structure.
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The hardest material on earth is currently considered to be diamond. Diamond is made of pure carbon atoms and has a unique crystal structure which gives it exceptional hardness and durability. It is widely recognized as the hardest naturally occurring substance known to man. Due to its hardness, diamond is used in various industrial applications, including cutting tools, drill bits, and abrasive materials. Its ability to withstand immense pressure and resist scratching makes it the reigning champion in terms of hardness.
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